Arrangement for the control of the motional actions on a cooling bed and a set of shears located before the cooling bed



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March 21, 1961 w. SCHNETTKER ARRANGEMENT FOR THE CONTROL OF THE MOTIONAL ACTI ON A COOLING BED AND A SET OF SHEARS LOCATED BEFORE THE COOLING BED Filed Jan. 31, 1957 March 21, 1961 w SCHNETTKER 2,975,883

ARRANGEMENT FOR THE CONTROL OF THE MOTIONAL ACTIONS ON A COOLING BED AND A SET OF SHEARS LOCATED BEFORE THE COOLING BED Filed Jan. 31, 1957 2 Sheets-Sheet 2 NGcZan eta/fit er Patented Mar. 21, 1961 GEWNT FOR THE CONTROL OF THE MO- TIONAL ACTIONS ON A COOLING BED AND A fig LATED BEFORE THE COOL- Wilheim Schnettker, Aachen, Germany, assignor to Schloemann Aktiengesellschaft, Dusseldorf, Germany In medium and line iron rolling mills in particular, cooling beds are arranged behind the finishing stand, and in front of these, cutting shears operating from a. stationary position, so as to be capable of performing a variety of jobs.

The cooling bed receives the rolled stock, as it comes ofi the finishing roll stand, in a take-up trough, it steadies it up and, all the time it is cooling off it moves it across the rack to the collecting plate from where it is fed in batches into the cutting shears to be subdivided into trade lengths.

As it comes from the finishing stand the rolled stock is cut up into cooling bed lengths by shears operating from a stationary position, after which it makes its way on to the lower, lifting section of the take-up trough wh ch is inclined towards the cooling bed and located next to same. There the rolled stock is seized by ejectors constituted by the base plates of the take-up trough located between the conveyor rollers; it is lifted from the rollersand steadied up so that the bars are taken over from the rack with their ends in the same position to each other, and moved across the cooling bed. Immediately the rolled stock is seized by the ejectors, a deflector bar blocks the take-up trough and guides the subsequent rolled stock on to the upper portion of the inclined trough section which lies behind the ejectors. After the ejectors have passed the previous bar on to the movable rack, they are moved back again below the level of the conveyor rollers so that the bar which, in the meantime has run up into position behind the ejectors, can slide into the lower, lifting section of the trough.

Conforming to the level of technological progress reached up to the present time, the sort of cooling bed control gear which has become familiar is that in which the motional actions in question, actuating the shears to subdivide the rolled stock, actuating the ejectors for steadying up and transferring the rolled stock from the take-up trough on to the rack, and blocking the take-up trough by means of the deflector bar until such time as the ejectors have completed their cycle of operation, take place through the medium of electrically actuated, mechanical switching organs.

The action of the rolled stock coming on to the takeup trough actuates-by means of a contact in the troughan auxiliary contactor across a mechanical timing relay corresponding to the degree of response retardation desired, so as to pass an operating impulse on to the coupling contactor. This sets into operation a switching mechanism which governs the amount of time the working sequence of the shears, ejectors and deflection bar will takethrough the medium of the particular coupling contactor involved-and, at the same time, by being synchronised with the speed at which the rolled stock runs oil, will work in dependence upon this speed.

Installations of this kind have the disadvantageknown to the expert for a long time nowthat, owing to the considerable fluctuations in timing determined by the widely difiering contact-make as a result of the nature of the rolled stocks surface striking the trough contact, chatter, and other circumstances contributing towards fluctuations at the auxiliary and operating contactor, or by electrical and mechanical retardation at the mechanical timing relay and switch mechanism, the operating cycle of the shears, ejectors and deflection bar can -be considerably retarded since the sum total of such fluctuations could add up arithmetically. The eflect of these fluctuations is that, because of the differently timed cutting sequence at the shears, the material is delivered in unequal cut-oil lengths on to the take-up roller bed and, because of the retarded delivery, is seized and steadied up by the ejectors too early or too late as the case may be, and the bars are consequently displaced laterally against each other when passing over the rack to the collecting plate. Because of the fact of the rolled stocks bar ends lying unevenly to each other, there is a not inconsiderable waste when the material is further subdivided by the cold cutters into trade or stock lengths and the finished material loses in length considerably unless special equipment is provided for the purpose of ensuring that the bars lie flush with each other.

Now, the object of the present invention is to replace the fluctuating switch organs by electronic switch organs which work free of any time lag, thereby ensuring a timeconstant working cycle of cutters, ejectors and deflector bar. In conformity with the invention, the action of the rolled stock coming on to the take-up roller bed actuates-without any mechanical power being involved and via the trough contact-an electronic switch (thyratron or ignitron) which, through the intermediary of an electronic counter with prcselector switches or, in fact several such counters, and depending on the preselection chosen, receives a certain numberof control impulses and, via a further electronic switch, operates the coupling for the shears thereby causing them to execute one cutting motion, as well as operating the ejector motor, and deflector bar motorsvia one contactor each or, if the ejectors and deflector bar are actuated by continuous-running motors, via electro-magnetic couplings, operates their electro-rnagnetic couplings through the intermediary of an electronic switch. In order to obtain synchronous running of the counter mechanism with the moving speed of the rolled stock too, the counter mechanism is synchronised with the moving rolled stock via a measuring roller and a transmitter coupled to same. In this manner the time-sequence of cutting is also controlled in dependence of theoften fluctuating-runoff speed from the finisher stand, so that even then a constant cutting length and a uniform working cycle-in terms of timeare achieved.

The invention will be further described with reference to the accompanying drawings illustrative of some examples of how the invention can be put into practical eflect. These are:

Figure l which shows in diagram form, the equipment for controlling the cooling bed and the shears arranged in front of same,

Figure 2 which shows a section through the cooling bed,

Figures 3a and 3!) show additional examples of circuit lay-out for the electronic counter mechanism with preselector switch.

The rolled stock 1 emerging from the finisher stand passes through shears 3 which cut from a stationary position and which are located in front of cooling bed 2. These shears can be designed as rotary shears (U.S.A. Serial No. 502,910) or as flying shears (U.S.A. Patent 3 No. 2,780,114). From the shears the rolled stock 1 passes via take-up rolltable 4 towards take-up trough 5 of cooling bed 2 which is equipped with driven conveyor rollers 6. In take-up roll table 4- is fitted measuring roller 7 with an impulse sender 9 located on the same shaft 8 and in the take-up trough 5 a trough contact 10. The trough contact 10 is closed by rolled stock 1 and transmits a control impulse on to grid 11 of a thyratron 12, which passes on a working impulse to a counter mechanism 13 with preselection (Literature: Handbuch der industriel len Elektronik, page 120 and following, by Dr. Reinhardt Kretzmann, Schaltungsbuch der industriellen Elektronik, page 44 and following, by Dr. Reinhardt Kretzmann, Verlag for Radio-, Foto-, Kinc- Technik G.m.-b.H., Berlin-Borsigwalde). This latter appliance, via [the preselection on the preselection switch 14 corresponding to the cutting sequence, transmits the working impulse via grid 15 of a further thyraton 16, to the electromagnetic shears coupling 17, by means of which the drive motor 18 is coupled via couple 17 to standingcut shears 3, the blades of which subdivide the moving rolled stock 1 in the course of one revolution. The rolled stock 1 now travels into take-up trough 5 which is inclined towards cooling bed 2, and is taken up from the conveyor rollers 6 and simultaneously steadied up by the ejectors 19, one for each roller beyond the deflector 26, these ejectors collectively forming the lower, lifting trough section. This movement of the lifting trough section takes place when the control command has been issued by the con trol impulse through the medium of the preselection or preselector switch 20 and contactor 21 through the medium of motor 22 and the crank gear driven by the latter, which actuates the ejector, but which is not illustrated in the drawing. In a corresponding switching sequence a further switch impulse is transmitted via the preselecticn on preselector 2.3 and contactor 24 to the lifting attachment 25 of deflector 26, as a result of which the lower portion of take-up trough 5 inclined towards cooling bed 2, is blocked. Because of this, the next lot of rolled stock 1 to be delivered runs along the upper portion of take-up trough 5 behind ejectors 19.

The further method of operation of cooling bed 2 is explained with reference to Figure 2.

The inclined take-up trough 5 receives the subdivided rolled stock 1 which is moved by conveyor rollers 6, the rolled stock 1 sliding under its own Weight into the sphere of action of ejectors 19 which lift by reason of the rotation of shaft 27, and, because of the lifting action of ejectors 19 it is taken off conveyor rollers 6 driven by motors 28, thereby causing its progress to be checked. In the position represented by broken lines in the diagram depicting ejectors 19, the rolled stock 1 is taken over in the familiar fashion by a movable rack 29 and passed on down the line. In the meantime, deflector 26 has blocked the lifting section of the trough so that the following batch of rolled stock 1 runs into the upper, non lifting section of trough, and takes up a position against the lateral partitioning wall 30 of the raised ejectors 19, which prevents it sliding down into the lower section of trough. Immediately the ejectors 19 return with their edges flush with take-up trough 5, the rolled stock 1 which had run up behind them, is able to slide into the lifting section of the trough. After that the cycle of operation repeats itself once again.

Apart from the one shown in Figure 1, other circuit arrangements for the electronic counter mechanism with preselector switching are possible, as per Figures 3a and 3b.

According to Figure 3a the counter mechanisms are connected up in series. In this instance counter mechanism 31 passes on the operational impulse via the corresponding preselection on preselector switch 32, to thyratron 16 controlling shears coupling 17, and simultaneously to counter mechanism 33 control-ling ejectors 19. Then, in accordance with the desired preselection on preselector switch 34, counter mechanism 33 transmits the control impulse for contactor 21 actuating the ejectors 19, and for counter mechanism 35 with preselector switch 36 actuating the deflector 26.

According to Figure 3b, the three counter mechanisms 37, 38, 39 are each connected in parallel with preselector switches 40, 4-1, 42 respectively. All three counter mechanisms 37, 38, 39 are then impulsed jointly and pass on, with a preselection capable of being set"independently of each other, the three control impulses desired, via the corresponding switching organs, to the standing-cut shears 3, the ejectors 19 and the deflector 26.

I claim:

1. Means for controlling the movements of lengths of rolled stock on their way from the shears that have severed them into lengths to a cooling bed, comprising: a laterally inclined take-up trough divided longitudinally into two parts, of which the upper part is fixed, while the lower part is movable up and down, means for raising and lowering the moveable part of the take-up trough between a lower position, in which it is flush with the fixed part, and a higher position, a :live roller bed for impel-ling the rolled material forward when it is in the fixed part of the take-up trough, and also when it is in the movable part so long as the movable part is in its lower position, a movable rack alongside the movable part of the take-up trough and between the take-up trough and the cooling bed, a deflector for guiding the lengths of rolled stock into the fixed'upper part of the take-up trough when the movable part is raised, the movable part then ejecting the rolled stock on to the movable rack for conveyance to the cooling bed, and at the same time forming a side wall bounding the fixed part, and the lateral inclination of the take-up trough causing the rolled material to slip down from the fixed part to the movable part when the movable part is lowered into its flush position.

2. Means for controlling the movements of lengths of rolled stock as claimed in claim 1, further comprising a trough contact adapted to be actuated by the advancing rolled stock, and means actuated by the trough contact for automatically controlling the live roller bed, the deflector, and the means for raising and lowering the movable part of the take-up trough.

References Cited in the file of this patent UNITED STATES PATENTS 653,506 Edwards July 10, 1900 691,159 Morgan Jan. 14, 1902 807,102 Zschernig Dec. 12, 1905 1,031,058 Edwards et al. July 2, 1912 1,905,461 Gassen Apr. 25, 1933 2,210,531 Engelbaugh Aug. 6, 1940 2,364,644 Mott et al. Dec. 12, 1944 2,498,449 Peterson Feb. 21, 1950 2,658,257 Bannister Nov. 10, 1953 2,698,659 Kosek et al. Jan. 4, 1955 2,732,896 Lundahl Jan. 31, 1956 FOREIGN PATENTS 305,023 Great Britain June 20, 1929 526,953 Germany June 12, 1931 

